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8n=13+7n
We move all terms to the left:
8n-(13+7n)=0
We add all the numbers together, and all the variables
8n-(7n+13)=0
We get rid of parentheses
8n-7n-13=0
We add all the numbers together, and all the variables
n-13=0
We move all terms containing n to the left, all other terms to the right
n=13
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